A study of acoustic emission from stressed rock

Knill, J.L.; Franklin, John A.; Malone, Andrew W.

doi:10.1016/0148-9062(68)90025-9

Cited by 49 publications

(15 citation statements)

References 7 publications

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“…El Moundni et al, 2000;Gori et al, 2000;Hardy 1972Hardy , 1981Hardy , 2003Knill et al, 1968;Koerner et al, 1981;Lockner and Byerlee 1995;Lord and Koerner 1979;McCabe 1980;Mogi, 1962;Pollock 1977;Rogers 2000;Scholz 1968;Surgeon et al, 2000;Wood et al, 1984;Yuyama 1986).…”

Section: Appendix Amentioning

confidence: 92%

Binary gas sorption/desorption experiments on a bituminous coal: Simultaneous measurements on sorption kinetics, volumetric strain and acoustic emission

Majewska

Ceglarska-Stefańska

Majewski

et al. 2009

International Journal of Coal Geology

123

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Section: Appendix Amentioning

confidence: 92%

Binary gas sorption/desorption experiments on a bituminous coal: Simultaneous measurements on sorption kinetics, volumetric strain and acoustic emission

Majewska

Ceglarska-Stefańska

Majewski

et al. 2009

International Journal of Coal Geology

123

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“…Among the innovative manufacturing process water jet have developed broad application (J.L. Knill et al, 1968).…”

Section: Fig:11mentioning

confidence: 99%

“…Water jet offers wide range of solutions in rock cutting and have greatly been used for disintigration of rocks. Manipulation of large volume of water at low pressure as a tool can be done efficiently and effectively (Knill et al, 1968). Over several decades granite is being actively used as a building material due to its exceptional properties like resistance to aesthetic properties and environmental effects (Zelenak et al,2015).…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Pulsating Water Jet Machining During Disintegration of Rocks by Means of Acoustic Emission

Tripathi¹,

Srivastava²,

Hloch

et al. 2017

Lecture Notes in Mechanical Engineering

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Over the decades water jet cutting has been widely used for rock disintegration in mining operations and quarrying purposes. The impact of high pressure waterjet on hard material like rock,coal ruins the original structure of the material therefore low pressure water-jet come into the existence. In recent year pulsating water jet has been applied in numerous ways such as surface cleaning, exclusion of damaged material layers, preparation of surfaces, and disintegration of materials. It has also a great potential for application in hard rock breakage as conventional methods are cumbersome, not readily accessible and have economical limitations.The performanceof the jet increses significantly by the generation of pulses causing disintegration of material at a relatively lower energy and costs. This paper focuses on the study of the disintegration processes of marble and granite by pulsating water jet subjected to erosion via accoustic emission.The experiments are performed by using pulsating water jet with modulation frequency of 20.20 kHz. The MVT circular nozzle with an orifice diameter of 0.9 mm, standoff distance from the target material was 6 mm, traverse speed varied from 2-16 mm/s and pump pressure 60 MPa was used for water jetting .The topography of granites and marble on the cut depth and surface quality were investigated by the optical profile-meter. Moreover, dependable relations between some physical and mechanical properties of the rocks and the depth of cut were observed. The online monitoring of acoustic emission shows the change in the response to the pulse frequency at different time intervals.

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“…AE monitoring has shed light on the onset of microcracking during deformation (or C′ , see Wong et al 1997), the evolution the spatial and temporal progression of microcracks (e.g. Knill et al 1968; Ohnaka 1983; Lockner 1991; Lockner 1993a; Benson et al 2007; Brantut et al 2011), and can be used in failure forecasting modelling (e.g. Bell et al 2011a,b).…”

Section: Description Of the Numerical Modelmentioning

confidence: 99%

Modelling the time-dependent rheological behaviour of heterogeneous brittle rocks

Tang

Zhao

et al. 2012

Geophysical Journal International

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International audienceA 2-D numerical model for brittle creep and stress relaxation is proposed for the timedependent brittle deformation of heterogeneous brittle rock under uniaxial loading conditions. The model accounts for material heterogeneity through a stochastic local failure stress ﬁeld, and local material degradation using an exponential material softening law. Importantly, the model introduces the concept of a mesoscopic renormalization to capture the co operative interaction between microcracks in the transition from distributed to localized damage. The model also describes the temporal and spatial evolution of acoustic emissions, including their size (energy released), in the medium during the progressive damage process. The model is ﬁrst validated using previously published experimental data and is then used to simulate brittle creep and stress relaxation experiments. The model accurately reproduces the classic trimodal behaviour (primary, secondary and tertiary creep) seen in laboratory brittle creep (constant stress) experiments and the decelerating stress during laboratory stress relaxation (constant strain) experiments. Brittle creep simulations also show evidence of a 'critical level of damage' before the onset of tertiary creep and the initial stages of localization can be seen as early as the start of the secondary creep phase, both of which have been previously observed in experiments. Stress relaxation simulations demonstrate that the total amount of stress relaxation increases when the level of constant axial strain increases, also corroborating with previously published experimental data. Our approach differs from previously adopted macroscopic approaches, based on constitutive laws, and microscopic approaches that focus on fracture propagation. The model shows that complex macroscopic time-dependent behaviour can be explained by the small-scale interaction of elements and material degradation. The fact that the simulations are able to capture a similar time-dependent response of heterogeneous brittle rocks to that seen in the laboratory implies that the model is appropriate to investigate the non-linear complicated time dependent behaviour of heterogeneous brittle rocks

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A study of acoustic emission from stressed rock

Cited by 49 publications

References 7 publications

Binary gas sorption/desorption experiments on a bituminous coal: Simultaneous measurements on sorption kinetics, volumetric strain and acoustic emission

Binary gas sorption/desorption experiments on a bituminous coal: Simultaneous measurements on sorption kinetics, volumetric strain and acoustic emission

Performance Analysis of Pulsating Water Jet Machining During Disintegration of Rocks by Means of Acoustic Emission

Modelling the time-dependent rheological behaviour of heterogeneous brittle rocks

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